Examples of Bad Background


 

Patch of spurious detections due to a bad background map caused by the bright central source (not on image):

[000887-M1] [000887-M1] [000887-M1]
 EPIC M1 image with sources overlaid (netscape)  EPIC M1 image (ds9)  EPIC M1 image with sources overlaid (ds9): cyan sources are flagged as false with the fat circles flagged for 'Bad background' while the others are flagged for other reasons (namely 'Bright background'). Fat green circles have the source comment 'In bad background region'.
 

 

Patches of spurious detections due to bad background map, caused by the central bright extended source:

[000436-PN] [000436-PN] [000436-PN]
 EPIC PN image with sources overlaid (netscape)  EPIC PN image (ds9)  EPIC PN image with sources overlaid (ds9): cyan sources are flagged as false with the fat circles flagged for 'Bad background' while the others are flagged for other reasons (mainly 'Bright pixel'). Fat green circles have the source comment 'In bad background region'.
 
[000436-PN] [000436-PN]
 EPIC PN image (ds9)  EPIC PN image with sources overlaid (ds9): cyan sources are flagged as false with the fat circles flagged for 'Bad background' while the others are flagged for other reasons (mainly 'Bright pixel'). Fat green circles have the source comment 'In bad background region'. All boxes have the flag 'Within extended' set.
 

 

Patch of spurious detections with unknown reason (probably bad background map), without a bright source in the image:

[000881-PN] [000881-PN] [000881-PN]
 EPIC PN image with sources overlaid (netscape)  EPIC PN image (ds9)  EPIC PN image with sources overlaid (ds9): cyan sources are flagged as false with the fat circles flagged for 'Bad background' while the others are flagged for other reasons (mainly 'Bright segment'). Fat green circles have the source comment 'In bad background region'.
 

  

Spurious detections due to bad background map caused by boresight movement:

[000450-PN] [000450-PN] [000450-PN]
 EPIC PN image with sources overlaid (netscape)  EPIC PN exposure map with sources overlaid (ds9)  EPIC PN image with sources overlaid (ds9): cyan sources are flagged as false with the fat circles flagged for 'Bad background' while the others are flagged for other reasons (namely 'Wing of bright src').


Screening Notes Example: Version 29.05.2003